Pairs, pips, and lots

This lesson explains how to calculate pip value, how lot size affects position sizing, and how to choose the right lot size for your account and risk budget. It is designed for someone who knows the basic forex terminology and wants to move from demo to live without confusing lot size with risk. See What is forex.

What is a pip

A pip is the smallest standard price movement in a currency pair. For most pairs, one pip is 0.0001. For pairs involving JPY, one pip is 0.01. Pip value is the monetary value of one pip for one standard lot.

Pip value depends on the pair and the account currency. On EUR/USD, one pip for a standard lot is approximately 10 USD. On USD/JPY, one pip for a standard lot is approximately 9 USD. If your account currency is different from the quote currency, you must convert the pip value.

Pip value follows from the pip definition:

pip_value (in quote currency) = pips x units

For EUR/USD:

0.0001 x 100000 = 10 USD per pip

Lot size

A standard lot is 100,000 units of the base currency. A mini lot is 10,000 units. A micro lot is 1,000 units. Some brokers also offer nano lots of 100 units.

Lot size determines the notional exposure and the pip value. A standard lot on EUR/USD has a notional value of 100,000 EUR and a pip value of about 10 USD. A mini lot has a notional value of 10,000 EUR and a pip value of about 1 USD. A micro lot has a notional value of 1,000 EUR and a pip value of about 0.10 USD.

Position sizing from pip value

Position size in forex is calculated from the risk budget and the stop distance in pips. The formula is:

position size in lots = (risk budget in account currency) / (stop distance in pips x pip value per lot)

If you risk 1 per cent of a 10,000-unit account, your risk budget is 100 units. If your stop is 20 pips away and the pip value per standard lot is 10 units, the position size is 100 / (20 x 10) = 0.5 standard lots. If you use mini lots with pip value 1 unit, the position size is 100 / (20 x 1) = 5 mini lots. The notional exposure is the same; only the lot denomination changes.

A full worked calculation:

1. Value of 1 pip on 1.00 lot = 10 USD x 4.00 = 40 units of account currency
2. How much per pip do you need?  100 / 20 pips = 5 per pip
3. Lot = 5 / 40 = 0.125

Result: 0.12 lots.

Protocol: stop from the chart, pip value from the calculator, then the lot.

Choosing the right lot size

The right lot size is the one that matches your risk budget and stop distance. It is not determined by the maximum leverage or by the smallest lot the broker offers. If your risk budget is 100 units and your stop is 50 pips away, a standard lot would risk 500 units, which is 5 per cent of capital — far above the 1–2 per cent rule.

A practical approach is:

1. Set your risk budget from the 1–2 per cent rule.
2. Measure your stop distance in pips.
3. Look up the pip value for your pair and account currency.
4. Calculate position size in lots.
5. Check that the required margin fits within your account.

Margin and leverage

Leverage allows you to control a large notional exposure with a small deposit. In the EU, retail leverage on major forex pairs is capped at 30:1 (ESMA/KNF limits). A standard lot on EUR/USD has a notional value of 100,000 EUR. At 30:1 leverage, the required margin is about 3,333 EUR per lot.

Margin is a deposit, not a fee. It is returned when the position is closed. If the price moves against you, the loss is deducted from the account equity, not from the margin. When equity falls to the margin close-out level, the broker will close the position.

Size follows from the 1 per cent rule, the stop, and the pip value — more in Leverage on forex in practice.

Common mistakes

• Choosing lot size based on the leverage slider instead of risk budget and stop distance.
• Using a standard lot on a small account because the broker allows it.
• Ignoring pip value when the account currency differs from the quote currency.
• Confusing mini lots and micro lots. A mini lot is 10,000 units, not 1,000.
• Increasing lot size after a series of wins because the account grew, without recalculating 1R.

Exercise

Choose one major pair. Calculate pip value for a standard lot, a mini lot, and a micro lot in your account currency. Then calculate position size for a 10,000-unit account with 1 per cent risk and a 20-pip stop. Record the results in your trading journal. Then verify it in your broker calculator.

Common questions

What is the difference between a pip and a pipette?

A pip is a conventional unit of movement (0.0001, or 0.01 on JPY); a pipette is a fraction of a pip in a 5-digit quote.

Why is pip value not constant in another currency?

The result is settled in the quote currency, and the rate to your currency changes. Convert it at the current rate.

Does a wider stop always mean more risk?

No. With a constant 1R a wider stop means a smaller lot; risk is set by the money budget.

Is a micro lot always safe?

No. A micro lot with tight capital and a wide stop can still exceed 1 percent.

How brokers quote forex prices

Brokers quote forex prices with a bid and an ask. The bid is the price at which you can sell the base currency; the ask is the price at which you can buy it. The difference between them is the spread. On major pairs, the spread is usually a few pips. On exotic pairs, it can be ten or more pips.

When you place a market order, you buy at the ask or sell at the bid. When you place a limit order, you specify the maximum price you are willing to pay or the minimum price you are willing to accept. A limit order gives you price control but no guarantee of fill.

Spread in pips versus spread in currency

Spread in pips is a standardised measure that allows you to compare costs across pairs and brokers. Spread in currency depends on lot size and pair. A 1-pip spread on a standard lot of EUR/USD is about 10 USD. A 1-pip spread on a mini lot is about 1 USD. A 1-pip spread on a micro lot is about 0.10 USD.

When you compare brokers, look at the spread in pips for your typical lot size. A broker that offers a 0.5-pip spread on EUR/USD for a standard lot saves you 5 USD per round trip compared to a broker with a 1-pip spread. Over one hundred trades, that is 500 USD.

Session overlap and spread

Spread tends to widen during low-liquidity periods. During the Asian session, major pairs may still have tight spreads, but crosses and exotics can widen significantly. During the overlap between London and New York, spreads are usually tightest.

If you trade during low-liquidity hours, widen your stop distance to account for the larger spread, or switch to a pair with better local liquidity. Trading a low-liquidity pair during the Asian session is a common cause of unexpected slippage.

Leverage and margin call

Leverage does not change the pip value. It changes the amount of margin required to open a position. At 30:1 leverage, one standard lot on EUR/USD requires about 3,333 EUR of margin. If your account is in USD, the margin is converted at the current rate.

If the price moves against you, the loss is deducted from your equity. When equity falls to the margin close-out level, the broker will close your positions. The distance to stop-out depends on the stop distance, the position size, and the margin close-out level, not on the maximum leverage.

Common mistakes expanded

• Using maximum leverage because it is available. Leverage is a margin efficiency tool, not an edge.
• Trading exotic pairs because the move looks larger. Wider spread and lower liquidity usually mean higher execution cost, not higher profit.
• Ignoring currency conversion when the account currency differs from the pair currency. Every profit and loss is converted at the broker’s rate.
• Forgetting that mini lots and micro lots change the pip value. A stop of 20 pips risks 20 USD on a mini lot, not 200 USD.
• Increasing lot size after a series of wins without recalculating 1R. The risk budget should change with equity, not with confidence.

Checklist before your first live forex trade

1. Verify the broker’s licence and leverage limit for your account type.
2. Record the spread in pips for your typical session and lot size.
3. Calculate pip value in your account currency.
4. Calculate position size from risk budget and stop distance.
5. Check that the required margin fits within your account.
6. Set a stop-loss and a take-profit before entering.

This checklist is not optional. Skipping any item turns forex trading into gambling.